Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 686 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 397 + 485 = 882. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 47 × 19 = 892. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 127 + 274 = 408. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 25 × 29 = 727. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 334 + 300 = 641. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 71 × 14 = 987. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 435 + 641 = 1077. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 89 × 88 = 7833. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 433 + 320 = 750. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 29 × 47 = 1363. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 86 × 52 = 4465. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 260 + 140 = 393. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 644 + 861 = 1505. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 330 + 770 = 1100. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 59 × 71 = 4189. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 97 × 27 = 2619. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 874 + 723 = 1597. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 24 × 79 = 1889. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 41 × 79 = 3239. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 148 + 806 = 953. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 54 × 64 = 3456. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 21 × 82 = 1719. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 61 × 19 = 1159. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 255 + 847 = 1097. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 964 + 121 = 1085. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 144 + 470 = 613. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 507 + 422 = 929. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 490 + 393 = 883. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 44 × 75 = 3300. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 71 × 58 = 4115. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 60 × 85 = 5108. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 43 × 24 = 1032. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 411 + 816 = 1227. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 765 + 150 = 915. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 37 × 13 = 489. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 82 × 28 = 2296. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 494 + 600 = 1094. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 78 × 16 = 1242. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 563 + 162 = 725. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 30 × 16 = 488. Correct or wrong? (a) wrong (b) correct

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